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Multi-organ structural and functional deficits in association with long COVID: a population-based case-control study
Alba Fernández-Sanlés1, Lucy J Goudswaard2, Dylan M Williams1
1Unit for Lifelong Health and Ageing, Institute of Cardiovascular Science, University College London, UK.
Eclinicalmedicine
|August 1, 2026
Summary
Long COVID patients show minimal multi-system deficits, with notable vascular issues like elevated blood pressure. Further research is needed to understand non-organ-related symptoms and guide long COVID care.
Area of Science:
- Multi-system diseases
- Infectious diseases
- Cardiovascular diseases
Background:
- Long COVID, a condition following SARS-CoV-2 infection, presents unknown multi-system impacts.
- Understanding the extent of organ damage and functional deficits in long COVID is crucial for patient management.
Purpose of the Study:
- To compare multi-system deficits between individuals with long COVID and matched controls.
- To identify specific organ systems affected by long COVID and quantify the severity of deficits.
Main Methods:
- A case-control study involving participants from two UK cohorts (ALSPAC and TwinsUK).
- Multi-system assessments including MRI (cardiac, brain, lung, kidney), autonomic function tests, spirometry, and exercise capacity tests.
- Deficit severity scored from 0 (none) to 3 (severe) across nine domains, with a composite multi-domain score.
Main Results:
- No significant multi-system deficits were found in long COVID cases compared to controls, except for the vascular domain.
- Elevated blood pressure was a key finding in the vascular domain, with higher odds in long COVID cases, particularly those with fatigue.
- A composite deficit score showed minimal difference between groups, suggesting limited widespread organ dysfunction.
Conclusions:
- Long COVID is not characterized by widespread subclinical organ dysfunction across multiple systems.
- Persistent vascular deficits, primarily elevated blood pressure, are evident in some long COVID patients.
- Non-organ-related mechanisms may contribute to long COVID symptoms, necessitating comprehensive clinical follow-up including blood pressure monitoring.
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